Abstract
In the present study, the laminar flow and heat transfer of water jet impingement enhanced with nano-encapsulated phase change material (NEPCM) slurry on a hot plate is analytically investigated for the first time. A similarity solution approach is applied to momentum and energy equations in order to determine the flow velocity and heat transfer fields. The effect of different physical parameters such as jet velocity, Reynolds number, jet inlet temperature, and the NEPCM concentration on the cooling performance of the impinging jet are investigated. The volume fraction of NEPCM particles plays an essential role in the flow and heat transfer fields. The results show that NEPCM slurry can significantly enhance the cooling performance of the system as it improves the latent heat storage capacity of the liquid jet. However, the maximum cooling performance of the system is achieved under an optimum NEPCM concentration (15%). A further increase in NEPCM volume fraction has an unfavorable effect due to increasing the viscosity and reducing the conductivity simultaneously. The effect of adding nano-metal particles on the heat transfer performance is also investigated and compared with NEPCM slurry. NEPCM slurry shows a better result in its maximum performance. Compared with the water jet, adding nano and NEPCM particles would overall enhance the system’s thermal performance by 16% and 7%, respectively.
Highlights
Jet impingement cooling (JIC) is a highly efficient technique in heat treatment, thermal management, and cooling of hot surfaces [1]
Adding nano-encapsulated phase change material (NEPCM) particles to the water jet can be effective if the inlet temperature is in the range of the melting temperature of the utilized PCM
There was an optimum value for the particle concentration that led to maximizing the heat transfer coefficient of JIC
Summary
Jet impingement cooling (JIC) is a highly efficient technique in heat treatment, thermal management, and cooling of hot surfaces [1]. Wu et al [30] experimentally investigated the effect of adding NEPCM particles in water to enhance the performance of jet impingement and spray cooling. Rehman et al [31] numerically investigated the thermal performance of free-surface jet impinging cooling using NEPCM slurry They employed a commercial computational fluid dynamics (CFD) code FLUENT to simulate the problem in a fully turbulent regime. To the best of our knowledge, no attempts have been made to analyze jet impingement cooling enhanced with NEPCM analytically By this reasonably simple approach presented in this study, significant reductions in the complexity and cost of the computations of jet impingement flow simulations are obtained.
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